added system.appType magic

lib/system.nim

@@ -813,11 +813,15 @@ const
   hostOS* {.magic: "HostOS"}: string = ""
     ## a string that describes the host operating system. Possible values:
     ## "windows", "macosx", "linux", "netbsd", "freebsd", "openbsd", "solaris",
-    ## "aix"
+    ## "aix".
         
   hostCPU* {.magic: "HostCPU"}: string = ""
     ## a string that describes the host CPU. Possible values:
-    ## "i386", "alpha", "powerpc", "sparc", "amd64", "mips", "arm"
+    ## "i386", "alpha", "powerpc", "sparc", "amd64", "mips", "arm".
+  
+  appType* {.magic: "AppType"}: string = ""
+    ## a string that describes the application type. Possible values:
+    ## "console", "gui", "lib".
   
 proc toFloat*(i: int): float {.
   magic: "ToFloat", noSideEffect, importc: "toFloat".}
@@ -1570,7 +1574,7 @@ when not defined(EcmaScript) and not defined(NimrodVM):
       result = n.sons[n.len]
 
   include "system/systhread"
-  include "system/mm"
+  include "system/mmdisp"
   include "system/sysstr"
   include "system/assign"
   include "system/repr"

lib/system/mmdisp.nim

@@ -130,6 +130,12 @@ when defined(boehmgc):
 
   include "system/cellsets"
 elif defined(nogc):
+  # Even though we don't want the GC, we cannot simply use C's memory manager
+  # because Nimrod's runtime wants ``realloc`` to zero out the additional
+  # space which C's ``realloc`` does not. And we cannot get the old size of an
+  # object, because C does not support this operation... Even though every
+  # possible implementation has to have a way to determine the object's size.
+  # C just sucks.
   include "system/alloc"
 
   when false: